What is CVE-2019-12471?

CVE-2019-12471 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-07-10.

How severe is CVE-2019-12471?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in MediaWiki

CVE-2019-12471

Wikimedia MediaWiki 1.30.0 through 1.32.1 has XSS. Loading user JavaScript from a non-existent account allows anyone to create the account, and perform XSS on users loading that script. Fixed in 1.32.2, 1.31.2, 1.30.2 and 1.27.6.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-07-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.9th percentile), scored 2026-10-26.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

MediaWiki
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.debian.org/security/2019/dsa-4460 (vendor-advisory, Third Party Advisory)
seclists.org/bugtraq/2019/Jun/12 (mailing-list, Mailing List, Third Party Advisory)
phabricator.wikimedia.org/T207603 (Third Party Advisory)
lists.wikimedia.org/pipermail/wikitech-l/2019-June/092152.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-12471?: CVE-2019-12471 is a medium-severity vulnerability in MediaWiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-07-10.
How severe is CVE-2019-12471?: Medium severity. CVSS v3 base score is 6.1 out of 10.